Material Drying
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PET mold temperature too low causing condensation
Problembeschreibung
Water-stain-like foggy spots appear on the bottle surface, which disappear briefly after wiping and then reappear; the problem worsens in seasons with high environmental humidity.
Ursachenanalyse
When the mold temperature is below the ambient dew point, water vapor in the air condenses on the cavity surface; the condensed water prevents the bottle surface from fitting and replicating the mold, forming foggy spots and surface defects.
Lösung
①Increase the mold temperature above the dew point; ②control the workshop humidity; ③keep the mold surface clean and polished; ④check the rationality of the chilled water temperature setting.; after adjustment, take consecutive samples to verify the effect, and resume mass production only after confirming stability
Wichtigste Erkenntnis
Condensation foggy spots are a typical manifestation of imbalance between mold temperature and environmental humidity; mold temperature is not the lower the better—it must be above the dew point to ensure surface replication quality.; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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